TWI220361B - Scanning method and device for performing gamma correction according to multiple gamma functions - Google Patents

Abstract

A scanning method for performing gamma correction according to multiple gamma functions includes the steps of: scanning a document using a plurality of sensing member sets to obtain a plurality of sets of front image signals, each sensing member set including a plurality of sensing members to sense light rays with the same color at the same time; loading a plurality of gamma functions, which corresponds to each sensing member set, from a memory; and correcting the plurality of sets of front image signals into a plurality of sets of post image signals according to the gamma functions. The invention also provides a scanning device using the scanning method.

Description

^ 361

[Technical field to which the invention belongs] The present invention relates to a scanning method and scanning method using multiple gamma (gamma interpolation devices. Scanning method and scanning device, in particular, a) function for gamma correction [prior art]

Fortunately, the scanning quality requirements are strict, and the traditional scanning image speculation: the two requirements are sufficient for users. Scanning device's CCD or c 1S ^ Hbra!! Ί ^ ^? ^ ^ ^ ¾ ^ ^ ^ (Wh, te Gamma correction to get the real image signal. ',,' and its internal can be used for the same-of course Only the conventional scanning device usually has an image sensing image containing red, green, blue, and / or black and white sensing elements. The image captured by a plurality of sensing element groups of the color system :: 嶋To the gamma curve corresponding to the sensing element group of the color system, the weight is correct.

The image sensor described above may also be a staggered-type image sensor. This staggered image sensing device has two sensing element groups arranged in parallel to sense the ϋ number of the same color system. The plurality of sensing elements of the two sensing element groups are staggered. The first sensing element group is sensing an odd array image signal, and the first sensing element group is sensing an even array image signal. Figure 1 shows a standard pattern used to correct the grayscale of an image. As shown in the figure, this standard pattern 100 has six blocks Pi to {) 6, which are long

1220361 V. Description of the invention (2) Correction patterns with different gray scale values (brightness). For example, the grayscale values of blocks P1 to 1 are gradually increasing. The standard pattern 100 is used for the image f to be sensed, and the actual signal obtained by the sensing is used to follow the standard signal of the correction pattern to make a gamma curve and a gamma function corresponding to the image sensor. > Fig. 2 is a graph showing exemptions and blocks generated by two image sensors after sensing the standard pattern of Fig. 1. As shown in FIG. 2, the horizontal axis represents sections p 丨 to P6, and the vertical axis represents brightness, and the curve 丨 丨 〇 corresponds to the sensing of a first sensing element group ... As a result, the curve 1 2 0 corresponds to a The sensing result of the second sensing element group and the curve 130 corresponds to the true characteristic of the standard pattern 1000. Due to the error of the clothing and the characteristics of the image sensor itself, a two-in-two sensing element group ㈣ one system ^ rK off the curve i 3 ΰ ο especially '纟 If the two sensing S pieces are not in the same clothing two q In the case of success, the difference is even more obvious. , Showing the results of the two image sensors. As shown in FIG. 3, scanning: Ϊ ί ί The sensor element group performs a pattern with the same gray level ′ will generate two different brightness segment patterns 14 and 15. In the father of the if image sensor, the two sensing element groups sense: the patterns of ^ are different. Furthermore, since the conventional technique ′ has no similar scan quality to that of the present case; Yuan 侔 Γ: 二 知 技 # is based on gamma correction for one group. In this way, it is easy to cause an odd image signal M ^ ^ ^ ^ /, and the moon shape, and these differences are quite unacceptable to some professionals locked in this case.

Page 6 1220361 V. Description of the invention (3) [Summary of the invention] Therefore, an object of the present invention is to provide a scanning method and a scanning device for performing gamma correction, using multiple gamma function differences to affect the scanning quality, Improved scanning to reduce manufacturing errors to meet the needs of various users. Knowing the description quality and fulfilling the above-mentioned objective, the present invention provides a scanning method for ordering gamma correction by using multiple gamma functions, including the following steps: scanning a document by a plurality of sensing elements to obtain a complex array A front image signal, each of the sensing element groups includes a plurality of sensing elements for sensing light of the same color; taking a plurality of gamma functions corresponding to each of the sensing element groups stored in a memory; and According to the gamma functions, the image signal before the complex array is corrected to the image signal after the complex array. To achieve the above object, the present invention also provides a scanning device for performing gamma correction by using multiple gamma functions, which includes a plurality of sensing element groups, a memory, and a processing circuit. These sensing element groups are used to scan a file 'to obtain the image signal before the complex array. Each of the sensing element groups includes a plurality of sensing elements for sensing light of the same color at the same time point. The memory system is used to store a plurality of gamma functions corresponding to each of the sensing element groups ^, and the processing circuit is to calibrate the image number of the front image of the complex array to the image signal of the rear of the complex array according to the gamma functions. By using multiple gamma functions for gamma correction, the effects caused by the uneven characteristics of different sensing element groups can be effectively prevented. V. Description of the Invention (4) [Embodiment] It is worth 5 ί = f is to use the above-mentioned standard pattern 100 to generate a gamma function. Adjustment = 疋, the number of segments of the standard pattern 100 may be positive i instead of six depending on the demand. And the second flow 4 shows the scanning method of gamma correction using the gamma function. As shown in FIG. 4, the gamma correction is performed on the household y, and one of Ben Sheming uses multiple gamma functions to perform step S40. The electric scan of several sensing elements is hard to see the female gamma function. In this step, ′ is obtained by obtaining a plurality of correction patterns with a plurality of phases Li having different gray scales, and replacing them with a plurality of pens. Then, the analog correction signals and the equal numbers are located at τ ± n. Then 'according to the correction patterns and the function. : Code: f Find these gammas corresponding to a plurality of image sensors. The future license can be stored in a scan body as a memory; the basis for performing gamma correction. Scoop element [d ~ Draw a file. In this step, the plurality of sensing elements' are used to obtain the image signal before the complex array. Each of the plurality of sensing elements is used to sense the same light. Call the $$, take out the gamma function corresponding to each of the sensing elements Ί; stored in the memory. :: S43 ·· According to these gamma functions, the complex array is front- and post-image signals respectively. These post-image signals correspond to the document images described. Conventional technology considers that the characteristics of each sensing element group are the same to consider that the exhaustion function of the mother-sensor element group is also the same, so only one of them is taken.

Page 8 1220361

Correction basis of the gamma function number of the sensing element group. Therefore, there is a requirement for the sensing information of the sensing element group. In comparison: the basis for correcting signals with high scan quality. A factor of 1: is the image of the document to be scanned that is sensed by these sensing element groups. It can truly reflect that the device is executed before leaving the factory: "Bottom value ::;", and step S40 can be performed by scanning steps S41 to S43. Knowing that the tracing device is used for scanning 'only needs to apply the above scanning method as follows. The scanning device of the present invention is φ φ. FIG. 5 shows a schematic view of the scanning device according to the first embodiment of the present invention. As shown in FIG. 5, the scanning device of the first embodiment includes an image sensor “, a processing circuit 51 And a memory 52. The image sensor 50 includes two sensing element groups 53 and 54 for scanning a document to obtain an image signal before the complex array. The sensing element group 53 includes a plurality of sensing elements 55, and the sensing element group 54 includes a plurality of sensing elements 56. Each of the sensing elements 55 and 56 is used to sense light of the same color at the same time point. For example, the sensing elements 5 5 and 5 6 are used to sense black, white, red, green, or blue light. It is worth noting that the image sensor 50 may include four groups of sensing elements 5 3 and 5 4 for sensing black and white, red, green, and blue, and light, or for sensing red, green, There are three groups of blue and blue light sensing element groups 53 and 54 to enable the scanning device to perform color scanning. In this embodiment, the sensing elements 55 and 56 are staggered and arranged in a row.

Page 9 1220361, invention description (6), in two straight lines. The front image signals obtained by the sensing elements 55 are digits, and the shirt image signals, and the front images tfL f obtained by the sensing elements 5 6 are even array image signals. The image signal of a scan line can be obtained by interpolating the image signal of the even array between the odd-numbered image and the image signal. 5 and 5 are used to store a gamma function corresponding to each of the sensing element groups 5 3 and 54. The processing circuit 51 corrects the image signal before " Hy complex array to the image signal after complex array respectively according to the gamma functions. The plurality of gamma functions can be obtained by the processing circuit 51 and step S40 described in FIG. 4 and stored in the memory 52. FIG. 6 is a schematic diagram of a scanning device according to a second embodiment of the present invention. As shown in FIG. 6, the scanning device of this embodiment is similar to the first embodiment, except that the image sensor 6 of this embodiment includes a plurality of sensing element groups 6 1 to 6 5 ′ and senses The plurality of sensing elements 6 1 Α to 6 5 Α of the element group 6 1 to 6 5 are arranged in a line. The sensing element groups 61 to 65 may be completed in different processes and then packaged into an image sensor 60, so there may be slight differences. The image signals sensed by each of the sensing element groups 61 to 65 are also subjected to gamma correction according to the corresponding gamma function. It is worth noting that the image sensor 60 may also include three or four sensing element groups 6 1 to 65 arranged in parallel to sense red, blue, green, and black and white light. Although the above-mentioned sensing element groups 61 to 65 belong to a charge-coupled element® (CCD) type sensing element group, a plurality of sensing elements of each sensing element group are specifically used to sense light of the same color. However, in other embodiments, the sensing element groups 61 to 65 may also belong to a contact image sensor (CIS) type sensing element group. When the sensing element groups 6 1 to 65 are C I S type sensing element groups, the sensing elements

Page 10 1220361 V. Description of the invention (7) At least three different colors of light are measured in the 6 1 A to 6 5 A round of flu. However, at the same time point, the sensing elements 6 1 A to 6 5 A are sensing the same color of light. At this time, each of the sensing element groups 6 1 to 65 may have a gamma function corresponding to three colors of red, green, and blue for correction, or may have a gamma function corresponding to white for correction, or There may be gamma functions corresponding to red, green, blue, and white for correction. FIG. 7 is a schematic diagram of a scanning device according to a third embodiment of the present invention. As shown in FIG. 7 'the scanning device of this embodiment is similar to the first embodiment, except that the image sensor 70 of this embodiment includes a plurality of sensing element groups 7 1 to 7 6' and the sensing elements The plurality of sensing elements 7 1 a to 7 6 A of groups 71 to 76 are aligned in two straight lines. The sensing element groups 71 to 76 may be completed in different processes and then packaged into the image sensor 70, so there may be slight differences. A gamma function corresponding to the image signal sensed by each of the sensing element groups 71 to 76 is used to perform gamma correction. It is worth noting that the image is used to sense red and blue = sensing element group 71 to depend on all sensing elements ^ :::: group j2 "The correction function can be or the characteristics of all sensing elements. Of course, The characteristics and signals of "Single Sense" are based on its own gamma function: "These are detected by 70" At the Chuanchun Office, 々々V / You are using the car ’s best method. _ In the car The details of the examples are explained in detail to facilitate the description of the technical content of the present invention. The eight-body example is only used in the case of encirclement, and various changes have been implemented :: and the following patent applications belong to the present invention Range

In the above embodiment, the present invention is not exceeded: the present invention is limited to 1220361 in a narrow sense. Brief Description of the Drawings Figure 1 shows a standard pattern for correcting the grayscale of an image. FIG. 2 is a graph showing the brightness and the area generated by the two image sensors after sensing the standard pattern in FIG. 1. FIG. 3 shows the results detected by the two image sensors. Fig. 4 shows a flowchart of a scanning method for gamma correction using a multiple gamma function. FIG. 5 is a schematic diagram of a scanning device according to a first embodiment of the present invention. FIG. 6 is a schematic diagram of a scanning device according to a second embodiment of the present invention. FIG. 7 is a schematic diagram of a scanning device according to a third embodiment of the present invention.

[Description of component representative symbols] S40 ~ Step S41 ~ Step S 4 2 ~ Step S43 ~ Step P1-P6 ~ Section 5 0, 6 0, 7 0 ~ Image sensor 5 1 ~ Processing circuit

5 2 ~ Memory 55, 56, 61A-65A, 71A-76A ~ Sensing Element® 5 3, 5 4, 6 1-6 5, 7 1-7 6 ~ Sensing Element Group I 0 0 ~ Calibration Pattern II 0, 1 2 0, 1 3 0 to curve 1 4 0, 1 5 0 to segment pattern

Page 12

Claims (1)

1220361 6. Scope of patent application 1. A method using multiple gamma functions includes the following steps: The scanning method of Ma K is to scan a file f image signal with a plurality of sensing element groups, and each sensing element group is substituted to obtain The plural front shadows sense the same-colored light at the time point ^ 3 multiple sensing elements for the same-removing and storing in-printing multiple gamma functions; the body A corresponds to the complex number of each sensing element group The image is based on a post-octet complex array of five-year-old gamma codes. "J corrects the image signal in front of the complex array to 2. Scanning method using gamma correction as described in item 1 of the scope of patent application, gamma weight function · With these sensing element groups Scanning steps: Patterns to obtain a plurality of analog corrections: (1) multiple corrections of gray scales, 4 corrections of analog correction signals according to these correction maps, and several digital positive signals; and functions. The correction signal is used to obtain the gamma lines of 3 gamma Λ ′, please use the multiple gamma function, 隹 ί / ¾ 刿-又 & τ trace method described in the first range of the range, wherein the plurality of sensing The element group is a cross-type sensing element group, and the children are arranged in two straight lines. The plurality of sensing elements of the sensing element group-phase 4 are as described in item 1 of the patent application scope. The use of the heavy gamma function, who hits the gamma correction sweep, hides it into the 杳 々, θϊ-Fine Wanfa ', where the plurality of sensing elements of the plurality of sensing element groups are arranged in a straight line. Suppose that the use of multiple gamma functions as described in item 丨 of the patent application On page 13…, the patent scope is 4 亍 Gamma calibration t + f, a number of salty, mesh I _ field methods, in which the complex sensing elements 该 70 of the plurality of sensing element groups are arranged in two straight lines and located at The plurality of 6 on the same straight line are used to sense the front image signals corresponding to the same scanning line. Contains: · A scanning device that uses multiple gamma functions to perform gamma correction, a plurality of sensing elements ★ And, using the former shadow boy but Gu ^ used # 彳 田 文件 'to obtain a complex array between 1 = ,, Each of the sensing element groups includes a plurality of sensing elements, and the light of the same color is sensed by using a single point; Gamma: Recall 1 'is used to store a plurality of corresponding sensing element groups. It looks like: 'Li Li circuit' according to these gamma functions respectively before the complex array? The image signal is a complex array. Γ 7. The scanning device using multiple gamma functions to encode positive numbers as described in item 6 of the scope of the patent application, wherein the plurality of sensing element groups are interleaved, then the element group, the complex number of the plurality of sensing element groups, The sensing elements are arranged in two straight lines. 8. A scanning device for ordering gamma correction using a multi-gamma function as described in item 6 of the scope of the patent application, wherein the plurality of sensing elements of the plurality of sensing element groups are arranged in a straight line. 9 · The scanning device using multiple gamma function% line gamma correction as described in item 6 of the scope of patent application, wherein the plurality of sensing elements of the plurality of sensing element groups are arranged in two straight lines and are located in the same line The plurality of sensing elements on the line are used to sense the previous image signals corresponding to the same-line drawing. 1 〇 Use the multiple gamma function as described in item β of the patent application Page 14 1220361 VI. Patent application Scanning device for gamma correction, where the plurality of sensing element groups are charge-coupled element (CCD) type sensing element groups. 11. The scanning device for performing gamma correction using multiple gamma functions as described in item 6 of the scope of the patent application, wherein the plurality of sensing element groups are contact image sensor (C I S) type sensing element groups. Page 15